Joseph tiiiebaut tschieret



, No. 620,996. Patented Mar. I4, I899.

J. T. TSCHIERET.

ELECTRIC ARC LAMP.

(Application filed Kay 9, 1898.)

(No Model.)

UNITED STATES PATENT OFFICE.

JOSEPH THIEBAUT TSOHIERET, OF LEVALLOIS-PERRET, FRANCE.

ELECTRIC-ARC LAM P.

'srncIFIoA'rIoiv forming part of Letters Patent No. 620,996, dated March 14, 1899.

' Application filed May 9,1898. smart. 680,192. (No model.)

T0 all whom it may concern.-

Be it known that I, JOSEPH THIEBAUT TSOHIERET, a citizen of the Republic of France, residing at Levallois-Perret, Seine, France, have invented a certain new and useful Improvement in Electric-Arc Lamps, (for which I have secured Letters Patent in France, dated October 23, 1897, No. 271,594; in England, dated April 26, 1898, No. 9,607, and in Germany, dated April 14:, 1898;) and I do hereby declare that the following is a full, clear, and exact specification of the same.

The present invention consists of a simple, strong, and steady arc-lamp which shall be capable of operating both with an alternate current and with a continuous current and high-tension currents without undergoing any further modification than the mere substitution of a coil.

The accompanying drawing is a diagram showing an arc-lamp according to my invention.

a b are two plates or disks connected by standards a and serving as a support for the entire mechanism of the lamp.

6 is the upper carbon-holder, sliding with but slight friction upon the guide f, fastened to the plate a, the said holder being furthermore guided by a sleeve rising from the top face of the plate 1).

i1 is the lower carbon-holder, connected to the upper holdere by means of a cord, chain, or band j, passing around pulleys Z. The lower holder 1' is guided by a sleeve m, projeci'ingdownwardl y from the plate I) and suitably insulated from the said holder.

at is a solenoid or electromagnet on a shunt from the internal circuit of the lamp, 0 and p being the terminals, which are respectively connected to the carbon-l1olders e and 2'.

The movable core q of the solenoid n is jointed to one end of a piece 4", which constitutes the lighting and regulating device proper. The said piece ris formed at its free end into a socket 1'', which slides with but very little friction upon the rod of the holder 6. At a suitable intermediate point of the piece 0, preferably nearer its connection with the core q than the socket r, is attached the lower end of a coiled spring 3, the other end of which is connected to an adjusting-screw be regulated as required. A stop-screw to engaging a lug e on the sleeve 9 regulates the length of the arc when'lighting.

The operation is as follows: The lamp be ing at rest and the carbons apart, if the current be turned on the solenoid n will attract the core q, and the latter will cause the piece r to move downward, the socket r carrying with it by friction the holder 6, whereby the two carbons will approach each other. On the carbons touching, the intensity of the current passing through the solenoid nwill be decreased to an extent that the attraction exerted by the said solenoid upon the core (1 will become too weak to oppose the action of the spring 3. The latter will then raise the piece 1', and by causing the socket 'r' to slightly bind upon or grip the holder 6 the latter will be raised, whereupon the carbons separate and the lamp lights. When, on the carbons consuming, the arc lengthens, the intensity of the current passing through the solenoid n increases and the solenoid attracts its core q more powerfully, whereby the piece 4 will be caused to descend gradually, together with the holder 6. When the piece 1" strikes the top of the sleeve g, it cannot move down any farther; but as the solenoid n still attracts the core q the piece T will be released from its gripping or binding action upon the holder 6, and the latter Will move down until the length of the are again becomes normal. The intensity of the current passing through the solenoid n will then again become too weak to oppose the action of the spring .9, which acting upwardly upon the piece 0" will cause the socket r to bind upon or grip the rod of the holder 8 and stop the latter in its downward movement.

I claim- An arc-lamp comprising two rigidly-connected frame-plates, sheaves revoluble in bearings secured to the upper plate, a guiderod depending from the upper plate, tubular guides arranged diametrically opposite each other respectively rising and depending from the lower plate,a tubular carbon-holder workin g in the tubular guide rising from the lower plate and on the guide-rod depending from the upper plate, a carbon-holder working in the tubular guide depending from the lower 6, by which the tension of the spring 3 may 1 plate, a flexible connection passing over the aforesaid sheaves and connecting said carb on-holders which latter are provided at their lower ends with a horizontal arm projecting toward each other to hold the carbons in the nections connecting the carbon-holders with a supply-circuit, and a shunt-circuit including the solenoid, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand, this 27th day of April, 1898, in presence of two subscribing witnesses.

JOSEPH THIEBAUT TSOIII'ERET.

Witnesses:

DOUGLAS 11. BRANDON, EDWARD P. MACLEAN. 

